mappings: add a map for albus the tree

src/mappings.rs

@@ -169,6 +169,12 @@ impl<const STRIDE_NUM: usize> StrideMapping<STRIDE_NUM> {
         ])
     }
 
+    pub fn new_albus() -> Self {
+        Self::from_json(&[
+            (0, 0, 50 * 3, false)
+        ])
+    }
+
     pub fn from_json(stride_json: &[(u8, u8, u8, bool)]) -> Self {
         let mut strides = [Stride::default(); STRIDE_NUM];
         let stride_count = stride_json.len();